Fix WidgetContainer assertion failure - add RemoveAllWidgets in generated destructor

Author: StackAndPointer

core/code_generator.py

@@ -285,6 +285,8 @@ def generate_cpp_for_interface(self, iface: Interface, project: Project) -> str:
         cpp += "}\n\n"
 
         cpp += f"{s.class_name}::~{s.class_name}()\n{{\n"
+        # Remove all child widgets from the container before deletion to satisfy WidgetContainer assertion
+        cpp += "    RemoveAllWidgets(false, false);\n"
         for wid in iface.widgets.values():
             if wid.class_name not in self.NON_WIDGET_TYPES:
                 var_name = self._get_var_name(wid)

docs/CORE_ARCHITECTURE_EN.md

@@ -534,15 +534,19 @@ Priority of user code in event handlers:
 ## User Code Regions
 
 ### C++ Version
+- `// [[[USER_INCLUDES]]]` - Custom header includes
+- `// [[[USER_FORWARD_DECLARATIONS]]]` - Forward declarations and enum definitions (before class definition)
 - `// [[[USER_DECLARATIONS]]]` - Member declarations
 - `// [[[USER_INIT]]]` - Initialization code
 - `// [[[USER_DESTROY]]]` - Cleanup code
 - `// [[[USER_DRAW]]]` - Custom drawing code
 - `// [[[USER_UPDATE]]]` - Update logic
 - `// [[[USER_FUNCTIONS]]]` - Custom functions
+- `// [[[USER_POST_CLASS]]]` - Post-class definitions (helper classes, etc., after class definition)
 - `// [[[HANDLER_widget_id]]]` - Event handler code
 
 ### C# Version
+- `// [[[USER_INCLUDES]]]` - Custom using statements
 - `// [[[USER_DECLARATIONS]]]` - Member declarations
 - `// [[[USER_INIT]]]` - Initialization code
 - `// [[[USER_DESTROY]]]` - Cleanup code